Answer / pushpendra ahirwar

It's correct answer is 40 years.
16 gm to 8 gm in 10 years
8 gm to 4 gm in 10 years {again}
4 gm to 2 gm in 10 years
2 gm to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years.

Answer / panda

answer is 70

Answer / valarmathy

16 gm reduced to 8gm in 10yrs
so 8 gm get decayed
for decaying 1 gm it takes 10/8 yrs
for decaying 8 gm it takes 10/8*8

remaining 8 gm
need to decay 7 to get 1 gm remaining
for decaying 7 it takes
10/8*8*7
=10*7
=70 years

Answer / mayank chopra

It's correct answer is 40 years.
16 gm to 8 gm in 10 years
8 gm to 4 gm in 10 years {again}
4 gm to 2 gm in 10 years
2 gm to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years.

Answer / kishan trambadiya

16 gms to 8 gms in 10 years
8 gms to 4 gms in 10 years {again}
4 gms to 2 gms in 10 years
2 gms to 1 gm in 10 years
So, It will take {10+10+10+10=40} 40 years

Answer / amit

40 years

Answer / engr shahid

it will take 18 years 2 month and 15 days
16 gm to 8 gm in 10 years
8 gm to 4 gm in 5 years {again}
4 gm to 2 gm in 2.5 years
2 gm to 1 gm in 1.25 years
So, It will take (10+5+2.5+1.25)years.

Answer / sridhar

another 8yrs sufficient to decay it to almost 1 gm

Answer / gomathi

As 16 gram takes 10 years to decay into 8 grams it will
take another ten years to become 0 grams so to become one
gram it may 19 years..

Answer / mazhar

it will take 18 years

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